Release 4.4: DB_AUTO_COMMIT

In previous Berkeley DB releases, the DB_AUTO_COMMIT flag was used in
the C and C++ Berkeley DB APIs to wrap operations within a transaction without
explicitly creating a transaction and passing the TXN handle
as part of the operation method call. In the 4.4 release, the
DB_AUTO_COMMIT flag no longer needs to be explicitly specified.

No related application changes are required for this release, as the
DB_AUTO_COMMIT flag is ignored where it is no longer needed.
However, application writers are encouraged to remove uses of the
DB_AUTO_COMMIT flag in places where it is no longer needed.

Similar changes have been made to the Berkeley DB Tcl API. These changes are
not optional, and Tcl applications will need to remove the -auto_commit
flag from methods where it is no longer needed.